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Introduced beginings of osgVolume NodeKit.

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This commit is contained in:
Robert Osfield 2008-09-16 15:32:23 +00:00
parent 28af7882f5
commit 6ea2adf1f5
9 changed files with 473 additions and 143 deletions
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6
examples/osgvolume/CMakeLists.txt
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@ -1,6 +1,6 @@
#this file is automatically generated
SET(TARGET_SRC osgvolume.cpp ) SET(TARGET_SRC osgvolume.cpp )
SET(TARGET_ADDED_LIBRARIES osgVolume )
#### end var setup ### #### end var setup ###
SETUP_EXAMPLE(osgvolume) SETUP_EXAMPLE(osgvolume)

198
examples/osgvolume/osgvolume.cpp
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@ -54,6 +54,7 @@
#include <algorithm> #include <algorithm>
#include <iostream> #include <iostream>
#include <osgVolume/ImageUtils>
typedef std::vector< osg::ref_ptr<osg::Image> > ImageList; typedef std::vector< osg::ref_ptr<osg::Image> > ImageList;
@ -68,105 +69,6 @@ typedef std::vector< osg::ref_ptr<osg::Image> > ImageList;
// }; // };
template <typename T, class O>
void _readRow(unsigned int num, GLenum pixelFormat, T* data,float scale, const O& operation)
{
switch(pixelFormat)
{
case(GL_LUMINANCE): { for(unsigned int i=0;i<num;++i) { float l = float(*data++)*scale; operation.luminance(l); } } break;
case(GL_ALPHA): { for(unsigned int i=0;i<num;++i) { float a = float(*data++)*scale; operation.alpha(a); } } break;
case(GL_LUMINANCE_ALPHA): { for(unsigned int i=0;i<num;++i) { float l = float(*data++)*scale; float a = float(*data++)*scale; operation.luminance_alpha(l,a); } } break;
case(GL_RGB): { for(unsigned int i=0;i<num;++i) { float r = float(*data++)*scale; float g = float(*data++)*scale; float b = float(*data++)*scale; operation.rgb(r,g,b); } } break;
case(GL_RGBA): { for(unsigned int i=0;i<num;++i) { float r = float(*data++)*scale; float g = float(*data++)*scale; float b = float(*data++)*scale; float a = float(*data++)*scale; operation.rgba(r,g,b,a); } } break;
case(GL_BGR): { for(unsigned int i=0;i<num;++i) { float b = float(*data++)*scale; float g = float(*data++)*scale; float r = float(*data++)*scale; operation.rgb(r,g,b); } } break;
case(GL_BGRA): { for(unsigned int i=0;i<num;++i) { float b = float(*data++)*scale; float g = float(*data++)*scale; float r = float(*data++)*scale; float a = float(*data++)*scale; operation.rgba(r,g,b,a); } } break;
}
}
template <class O>
void readRow(unsigned int num, GLenum pixelFormat, GLenum dataType, unsigned char* data, const O& operation)
{
switch(dataType)
{
case(GL_BYTE): _readRow(num,pixelFormat, (char*)data, 1.0f/128.0f, operation); break;
case(GL_UNSIGNED_BYTE): _readRow(num,pixelFormat, (unsigned char*)data, 1.0f/255.0f, operation); break;
case(GL_SHORT): _readRow(num,pixelFormat, (short*) data, 1.0f/32768.0f, operation); break;
case(GL_UNSIGNED_SHORT): _readRow(num,pixelFormat, (unsigned short*)data, 1.0f/65535.0f, operation); break;
case(GL_INT): _readRow(num,pixelFormat, (int*) data, 1.0f/2147483648.0f, operation); break;
case(GL_UNSIGNED_INT): _readRow(num,pixelFormat, (unsigned int*) data, 1.0f/4294967295.0f, operation); break;
case(GL_FLOAT): _readRow(num,pixelFormat, (float*) data, 1.0f, operation); break;
}
}
template <class O>
void readImage(osg::Image* image, const O& operation)
{
if (!image) return;
for(int r=0;r<image->r();++r)
{
for(int t=0;t<image->t();++t)
{
readRow(image->s(), image->getPixelFormat(), image->getDataType(), image->data(0,t,r), operation);
}
}
}
// example ModifyOperator
// struct ModifyOperator
// {
// inline void luminance(float& l) const {}
// inline void alpha(float& a) const {}
// inline void luminance_alpha(float& l,float& a) const {}
// inline void rgb(float& r,float& g,float& b) const {}
// inline void rgba(float& r,float& g,float& b,float& a) const {}
// };
template <typename T, class M>
void _modifyRow(unsigned int num, GLenum pixelFormat, T* data,float scale, const M& operation)
{
float inv_scale = 1.0f/scale;
switch(pixelFormat)
{
case(GL_LUMINANCE): { for(unsigned int i=0;i<num;++i) { float l = float(*data)*scale; operation.luminance(l); *data++ = T(l*inv_scale); } } break;
case(GL_ALPHA): { for(unsigned int i=0;i<num;++i) { float a = float(*data)*scale; operation.alpha(a); *data++ = T(a*inv_scale); } } break;
case(GL_LUMINANCE_ALPHA): { for(unsigned int i=0;i<num;++i) { float l = float(*data)*scale; float a = float(*(data+1))*scale; operation.luminance_alpha(l,a); *data++ = T(l*inv_scale); *data++ = T(a*inv_scale); } } break;
case(GL_RGB): { for(unsigned int i=0;i<num;++i) { float r = float(*data)*scale; float g = float(*(data+1))*scale; float b = float(*(data+2))*scale; operation.rgb(r,g,b); *data++ = T(r*inv_scale); *data++ = T(g*inv_scale); *data++ = T(b*inv_scale); } } break;
case(GL_RGBA): { for(unsigned int i=0;i<num;++i) { float r = float(*data)*scale; float g = float(*(data+1))*scale; float b = float(*(data+2))*scale; float a = float(*(data+3))*scale; operation.rgba(r,g,b,a); *data++ = T(r*inv_scale); *data++ = T(g*inv_scale); *data++ = T(g*inv_scale); *data++ = T(a*inv_scale); } } break;
case(GL_BGR): { for(unsigned int i=0;i<num;++i) { float b = float(*data)*scale; float g = float(*(data+1))*scale; float r = float(*(data+2))*scale; operation.rgb(r,g,b); *data++ = T(b*inv_scale); *data++ = T(g*inv_scale); *data++ = T(r*inv_scale); } } break;
case(GL_BGRA): { for(unsigned int i=0;i<num;++i) { float b = float(*data)*scale; float g = float(*(data+1))*scale; float r = float(*(data+2))*scale; float a = float(*(data+3))*scale; operation.rgba(r,g,b,a); *data++ = T(g*inv_scale); *data++ = T(b*inv_scale); *data++ = T(r*inv_scale); *data++ = T(a*inv_scale); } } break;
}
}
template <class M>
void modifyRow(unsigned int num, GLenum pixelFormat, GLenum dataType, unsigned char* data, const M& operation)
{
switch(dataType)
{
case(GL_BYTE): _modifyRow(num,pixelFormat, (char*)data, 1.0f/128.0f, operation); break;
case(GL_UNSIGNED_BYTE): _modifyRow(num,pixelFormat, (unsigned char*)data, 1.0f/255.0f, operation); break;
case(GL_SHORT): _modifyRow(num,pixelFormat, (short*) data, 1.0f/32768.0f, operation); break;
case(GL_UNSIGNED_SHORT): _modifyRow(num,pixelFormat, (unsigned short*)data, 1.0f/65535.0f, operation); break;
case(GL_INT): _modifyRow(num,pixelFormat, (int*) data, 1.0f/2147483648.0f, operation); break;
case(GL_UNSIGNED_INT): _modifyRow(num,pixelFormat, (unsigned int*) data, 1.0f/4294967295.0f, operation); break;
case(GL_FLOAT): _modifyRow(num,pixelFormat, (float*) data, 1.0f, operation); break;
}
}
template <class M>
void modifyImage(osg::Image* image, const M& operation)
{
if (!image) return;
for(int r=0;r<image->r();++r)
{
for(int t=0;t<image->t();++t)
{
modifyRow(image->s(), image->getPixelFormat(), image->getDataType(), image->data(0,t,r), operation);
}
}
}
struct PassThroughTransformFunction struct PassThroughTransformFunction
{ {
@ -934,7 +836,7 @@ osg::Node* createShaderModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<os
" }\n" " }\n"
" }\n" " }\n"
"\n" "\n"
" const float max_iteratrions = 256.0;\n" " const float max_iteratrions = 2048.0;\n"
" float num_iterations = length(te-t0)/sampleDensity;\n" " float num_iterations = length(te-t0)/sampleDensity;\n"
" if (num_iterations>max_iteratrions) \n" " if (num_iterations>max_iteratrions) \n"
" {\n" " {\n"
@ -1304,27 +1206,6 @@ osg::Node* createModel(osg::ref_ptr<osg::Image>& image_3d,
return group; return group;
} }
struct FindRangeOperator
{
FindRangeOperator():
_rmin(FLT_MAX),
_rmax(-FLT_MAX),
_gmin(FLT_MAX),
_gmax(-FLT_MAX),
_bmin(FLT_MAX),
_bmax(-FLT_MAX),
_amin(FLT_MAX),
_amax(-FLT_MAX) {}
mutable float _rmin, _rmax, _gmin, _gmax, _bmin, _bmax, _amin, _amax;
inline void luminance(float l) const { rgb(l,l,l); }
inline void alpha(float a) const { _amin = osg::minimum(a,_amin); _amax = osg::maximum(a,_amax); }
inline void luminance_alpha(float l,float a) const { rgb(l,l,l); alpha(a); }
inline void rgb(float r,float g,float b) const { _rmin = osg::minimum(r,_rmin); _rmax = osg::maximum(r,_rmax); _gmin = osg::minimum(g,_gmin); _gmax = osg::maximum(g,_gmax); _bmin = osg::minimum(b,_bmin); _bmax = osg::maximum(b,_bmax); }
inline void rgba(float r,float g,float b,float a) const { rgb(r,g,b); alpha(a); }
};
struct ScaleOperator struct ScaleOperator
{ {
ScaleOperator():_scale(1.0f) {} ScaleOperator():_scale(1.0f) {}
@ -1444,9 +1325,9 @@ osg::Image* readRaw(int sizeX, int sizeY, int sizeZ, int numberBytesPerComponent
// normalise texture // normalise texture
{ {
// compute range of values // compute range of values
FindRangeOperator rangeOp; osg::Vec4 minValue, maxValue;
readImage(image.get(), rangeOp); osgVolume::computeMinMax(image.get(), minValue, maxValue);
modifyImage(image.get(),ScaleOperator(1.0f/rangeOp._rmax)); osgVolume::modifyImage(image.get(),ScaleOperator(1.0f/maxValue.r()));
} }
@ -1471,12 +1352,12 @@ osg::Image* readRaw(int sizeX, int sizeY, int sizeZ, int numberBytesPerComponent
writeOp._pos = 0; writeOp._pos = 0;
// read the pixels into readOp's _colour array // read the pixels into readOp's _colour array
readRow(sizeS, pixelFormat, dataType, image->data(0,t,r), readOp); osgVolume::readRow(sizeS, pixelFormat, dataType, image->data(0,t,r), readOp);
// pass readOp's _colour array contents over to writeOp (note this is just a pointer swap). // pass readOp's _colour array contents over to writeOp (note this is just a pointer swap).
writeOp._colours.swap(readOp._colours); writeOp._colours.swap(readOp._colours);
modifyRow(sizeS, pixelFormat, GL_UNSIGNED_BYTE, new_image->data(0,t,r), writeOp); osgVolume::modifyRow(sizeS, pixelFormat, GL_UNSIGNED_BYTE, new_image->data(0,t,r), writeOp);
// return readOp's _colour array contents back to its rightful owner. // return readOp's _colour array contents back to its rightful owner.
writeOp._colours.swap(readOp._colours); writeOp._colours.swap(readOp._colours);
@ -1541,15 +1422,15 @@ void doColourSpaceConversion(ColourSpaceOperation op, osg::Image* image, osg::Ve
{ {
case (MODULATE_ALPHA_BY_LUMINANCE): case (MODULATE_ALPHA_BY_LUMINANCE):
std::cout<<"doing conversion MODULATE_ALPHA_BY_LUMINANCE"<<std::endl; std::cout<<"doing conversion MODULATE_ALPHA_BY_LUMINANCE"<<std::endl;
modifyImage(image,ModulateAlphaByLuminanceOperator()); osgVolume::modifyImage(image,ModulateAlphaByLuminanceOperator());
break; break;
case (MODULATE_ALPHA_BY_COLOUR): case (MODULATE_ALPHA_BY_COLOUR):
std::cout<<"doing conversion MODULATE_ALPHA_BY_COLOUR"<<std::endl; std::cout<<"doing conversion MODULATE_ALPHA_BY_COLOUR"<<std::endl;
modifyImage(image,ModulateAlphaByColourOperator(colour)); osgVolume::modifyImage(image,ModulateAlphaByColourOperator(colour));
break; break;
case (REPLACE_ALPHA_WITH_LUMINACE): case (REPLACE_ALPHA_WITH_LUMINACE):
std::cout<<"doing conversion REPLACE_ALPHA_WITH_LUMINACE"<<std::endl; std::cout<<"doing conversion REPLACE_ALPHA_WITH_LUMINACE"<<std::endl;
modifyImage(image,ReplaceAlphaWithLuminanceOperator()); osgVolume::modifyImage(image,ReplaceAlphaWithLuminanceOperator());
break; break;
default: default:
break; break;
@ -1603,7 +1484,8 @@ osg::Image* applyTransferFunction(osg::Image* image, osg::TransferFunction1D* tr
osg::Image* output_image = new osg::Image; osg::Image* output_image = new osg::Image;
output_image->allocateImage(image->s(),image->t(), image->r(), GL_RGBA, GL_UNSIGNED_BYTE); output_image->allocateImage(image->s(),image->t(), image->r(), GL_RGBA, GL_UNSIGNED_BYTE);
readImage(image,ApplyTransferFunctionOperator(transferFunction, output_image->data())); ApplyTransferFunctionOperator op(transferFunction, output_image->data());
osgVolume::readImage(image,op);
return output_image; return output_image;
} }
@ -1912,6 +1794,51 @@ int main( int argc, char **argv )
std::cout<<"No model loaded, please specify and volumetric image file on the command line."<<std::endl; std::cout<<"No model loaded, please specify and volumetric image file on the command line."<<std::endl;
return 1; return 1;
} }
osg::RefMatrix* matrix = dynamic_cast<osg::RefMatrix*>(image_3d->getUserData());
if (matrix)
{
osg::notify(osg::NOTICE)<<"Image has Matrix = "<<*matrix<<std::endl;
xSize = image_3d->s() * (*matrix)(0,0);
ySize = image_3d->t() * (*matrix)(1,1);
zSize = image_3d->r() * (*matrix)(2,2);
}
osg::Vec4 minValue, maxValue;
if (osgVolume::computeMinMax(image_3d.get(), minValue, maxValue));
{
osg::notify(osg::NOTICE)<<"Min value "<<minValue<<std::endl;
osg::notify(osg::NOTICE)<<"Max value "<<maxValue<<std::endl;
float minComponent = minValue[0];
minComponent = osg::minimum(minComponent,minValue[1]);
minComponent = osg::minimum(minComponent,minValue[2]);
minComponent = osg::minimum(minComponent,minValue[3]);
float maxComponent = maxValue[0];
maxComponent = osg::maximum(maxComponent,maxValue[1]);
maxComponent = osg::maximum(maxComponent,maxValue[2]);
maxComponent = osg::maximum(maxComponent,maxValue[3]);
float scale = 0.99f/(maxComponent-minComponent);
float offset = -minComponent * scale;
osgVolume::offsetAndScaleImage(image_3d.get(),
osg::Vec4(offset, offset, offset, offset),
osg::Vec4(scale, scale, scale, scale));
}
#if 0
osg::Vec4 newMinValue, newMaxValue;
if (osgVolume::computeMinMax(image_3d.get(), newMinValue, newMaxValue));
{
osg::notify(osg::NOTICE)<<"After min value "<<newMinValue<<std::endl;
osg::notify(osg::NOTICE)<<"After max value "<<newMaxValue<<std::endl;
}
#endif
if (colourSpaceOperation!=NO_COLOUR_SPACE_OPERATION) if (colourSpaceOperation!=NO_COLOUR_SPACE_OPERATION)
{ {
@ -1926,16 +1853,7 @@ int main( int argc, char **argv )
osg::ref_ptr<osg::Image> normalmap_3d = createNormalMap ? createNormalMapTexture(image_3d.get()) : 0; osg::ref_ptr<osg::Image> normalmap_3d = createNormalMap ? createNormalMapTexture(image_3d.get()) : 0;
osg::RefMatrix* matrix = dynamic_cast<osg::RefMatrix*>(image_3d->getUserData());
if (matrix)
{
osg::notify(osg::NOTICE)<<"Image has Matrix = "<<*matrix<<std::endl;
xSize = image_3d->s() * (*matrix)(0,0);
ySize = image_3d->t() * (*matrix)(1,1);
zSize = image_3d->r() * (*matrix)(2,2);
}
// create a model from the images. // create a model from the images.
osg::Node* rootNode = 0; osg::Node* rootNode = 0;

47
include/osgVolume/Export Normal file
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@ -0,0 +1,47 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSGVOLUME_EXPORT_
#define OSGVOLUME_EXPORT_ 1
#if defined(_MSC_VER)
#pragma warning( disable : 4244 )
#pragma warning( disable : 4251 )
#pragma warning( disable : 4267 )
#pragma warning( disable : 4275 )
#pragma warning( disable : 4290 )
#pragma warning( disable : 4786 )
#pragma warning( disable : 4305 )
#pragma warning( disable : 4996 )
#endif
#if defined(_MSC_VER) || defined(__CYGWIN__) || defined(__MINGW32__) || defined( __BCPLUSPLUS__)
# if defined( OSG_LIBRARY_STATIC )
# define OSGVOLUME_EXPORT
# elif defined( OSGVOLUME_LIBRARY )
# define OSGVOLUME_EXPORT __declspec(dllexport)
# else
# define OSGVOLUME_EXPORT __declspec(dllimport)
# endif
#else
# define OSGVOLUME_EXPORT
#endif
/**
\namespace osgVolume
The osgVolume library is a NodeKit that extends the core scene graph to support volume rendering.
*/
#endif

132
include/osgVolume/ImageUtils Normal file
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@ -0,0 +1,132 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSGVOLUME_IMAGEUTILS
#define OSGVOLUME_IMAGEUTILS 1
#include <osgVolume/Export>
#include <osg/Image>
namespace osgVolume {
template <typename T, class O>
void _readRow(unsigned int num, GLenum pixelFormat, const T* data,float scale, O& operation)
{
switch(pixelFormat)
{
case(GL_LUMINANCE): { for(unsigned int i=0;i<num;++i) { float l = float(*data++)*scale; operation.luminance(l); } } break;
case(GL_ALPHA): { for(unsigned int i=0;i<num;++i) { float a = float(*data++)*scale; operation.alpha(a); } } break;
case(GL_LUMINANCE_ALPHA): { for(unsigned int i=0;i<num;++i) { float l = float(*data++)*scale; float a = float(*data++)*scale; operation.luminance_alpha(l,a); } } break;
case(GL_RGB): { for(unsigned int i=0;i<num;++i) { float r = float(*data++)*scale; float g = float(*data++)*scale; float b = float(*data++)*scale; operation.rgb(r,g,b); } } break;
case(GL_RGBA): { for(unsigned int i=0;i<num;++i) { float r = float(*data++)*scale; float g = float(*data++)*scale; float b = float(*data++)*scale; float a = float(*data++)*scale; operation.rgba(r,g,b,a); } } break;
case(GL_BGR): { for(unsigned int i=0;i<num;++i) { float b = float(*data++)*scale; float g = float(*data++)*scale; float r = float(*data++)*scale; operation.rgb(r,g,b); } } break;
case(GL_BGRA): { for(unsigned int i=0;i<num;++i) { float b = float(*data++)*scale; float g = float(*data++)*scale; float r = float(*data++)*scale; float a = float(*data++)*scale; operation.rgba(r,g,b,a); } } break;
}
}
template <class O>
void readRow(unsigned int num, GLenum pixelFormat, GLenum dataType, const unsigned char* data, O& operation)
{
switch(dataType)
{
case(GL_BYTE): _readRow(num,pixelFormat, (const char*)data, 1.0f/128.0f, operation); break;
case(GL_UNSIGNED_BYTE): _readRow(num,pixelFormat, (const unsigned char*)data, 1.0f/255.0f, operation); break;
case(GL_SHORT): _readRow(num,pixelFormat, (const short*) data, 1.0f/32768.0f, operation); break;
case(GL_UNSIGNED_SHORT): _readRow(num,pixelFormat, (const unsigned short*)data, 1.0f/65535.0f, operation); break;
case(GL_INT): _readRow(num,pixelFormat, (const int*) data, 1.0f/2147483648.0f, operation); break;
case(GL_UNSIGNED_INT): _readRow(num,pixelFormat, (const unsigned int*) data, 1.0f/4294967295.0f, operation); break;
case(GL_FLOAT): _readRow(num,pixelFormat, (const float*) data, 1.0f, operation); break;
}
}
template <class O>
void readImage(const osg::Image* image, O& operation)
{
if (!image) return;
for(int r=0;r<image->r();++r)
{
for(int t=0;t<image->t();++t)
{
readRow(image->s(), image->getPixelFormat(), image->getDataType(), image->data(0,t,r), operation);
}
}
}
// example ModifyOperator
// struct ModifyOperator
// {
// inline void luminance(float& l) const {}
// inline void alpha(float& a) const {}
// inline void luminance_alpha(float& l,float& a) const {}
// inline void rgb(float& r,float& g,float& b) const {}
// inline void rgba(float& r,float& g,float& b,float& a) const {}
// };
template <typename T, class M>
void _modifyRow(unsigned int num, GLenum pixelFormat, T* data,float scale, const M& operation)
{
float inv_scale = 1.0f/scale;
switch(pixelFormat)
{
case(GL_LUMINANCE): { for(unsigned int i=0;i<num;++i) { float l = float(*data)*scale; operation.luminance(l); *data++ = T(l*inv_scale); } } break;
case(GL_ALPHA): { for(unsigned int i=0;i<num;++i) { float a = float(*data)*scale; operation.alpha(a); *data++ = T(a*inv_scale); } } break;
case(GL_LUMINANCE_ALPHA): { for(unsigned int i=0;i<num;++i) { float l = float(*data)*scale; float a = float(*(data+1))*scale; operation.luminance_alpha(l,a); *data++ = T(l*inv_scale); *data++ = T(a*inv_scale); } } break;
case(GL_RGB): { for(unsigned int i=0;i<num;++i) { float r = float(*data)*scale; float g = float(*(data+1))*scale; float b = float(*(data+2))*scale; operation.rgb(r,g,b); *data++ = T(r*inv_scale); *data++ = T(g*inv_scale); *data++ = T(b*inv_scale); } } break;
case(GL_RGBA): { for(unsigned int i=0;i<num;++i) { float r = float(*data)*scale; float g = float(*(data+1))*scale; float b = float(*(data+2))*scale; float a = float(*(data+3))*scale; operation.rgba(r,g,b,a); *data++ = T(r*inv_scale); *data++ = T(g*inv_scale); *data++ = T(g*inv_scale); *data++ = T(a*inv_scale); } } break;
case(GL_BGR): { for(unsigned int i=0;i<num;++i) { float b = float(*data)*scale; float g = float(*(data+1))*scale; float r = float(*(data+2))*scale; operation.rgb(r,g,b); *data++ = T(b*inv_scale); *data++ = T(g*inv_scale); *data++ = T(r*inv_scale); } } break;
case(GL_BGRA): { for(unsigned int i=0;i<num;++i) { float b = float(*data)*scale; float g = float(*(data+1))*scale; float r = float(*(data+2))*scale; float a = float(*(data+3))*scale; operation.rgba(r,g,b,a); *data++ = T(g*inv_scale); *data++ = T(b*inv_scale); *data++ = T(r*inv_scale); *data++ = T(a*inv_scale); } } break;
}
}
template <class M>
void modifyRow(unsigned int num, GLenum pixelFormat, GLenum dataType, unsigned char* data, const M& operation)
{
switch(dataType)
{
case(GL_BYTE): _modifyRow(num,pixelFormat, (char*)data, 1.0f/128.0f, operation); break;
case(GL_UNSIGNED_BYTE): _modifyRow(num,pixelFormat, (unsigned char*)data, 1.0f/255.0f, operation); break;
case(GL_SHORT): _modifyRow(num,pixelFormat, (short*) data, 1.0f/32768.0f, operation); break;
case(GL_UNSIGNED_SHORT): _modifyRow(num,pixelFormat, (unsigned short*)data, 1.0f/65535.0f, operation); break;
case(GL_INT): _modifyRow(num,pixelFormat, (int*) data, 1.0f/2147483648.0f, operation); break;
case(GL_UNSIGNED_INT): _modifyRow(num,pixelFormat, (unsigned int*) data, 1.0f/4294967295.0f, operation); break;
case(GL_FLOAT): _modifyRow(num,pixelFormat, (float*) data, 1.0f, operation); break;
}
}
template <class M>
void modifyImage(osg::Image* image, const M& operation)
{
if (!image) return;
for(int r=0;r<image->r();++r)
{
for(int t=0;t<image->t();++t)
{
modifyRow(image->s(), image->getPixelFormat(), image->getDataType(), image->data(0,t,r), operation);
}
}
}
/** Compute the min max colour values in the image.*/
extern OSGVOLUME_EXPORT bool computeMinMax(const osg::Image* image, osg::Vec4& min, osg::Vec4& max);
/** Compute the min max colour values in the image.*/
extern OSGVOLUME_EXPORT bool offsetAndScaleImage(osg::Image* image, const osg::Vec4& offset, const osg::Vec4& scale);
}
#endif

46
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@ -0,0 +1,46 @@
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSGVOLUME_VERSION
#define OSGVOLUME_VERSION 1
#include <osgVolume/Export>
extern "C" {
/**
* osgVolumeGetVersion() returns the library version number.
* Numbering convention : OpenSceneGraph-1.0 will return 1.0 from osgVolumeGetVersion.
*
* This C function can be also used to check for the existence of the OpenSceneGraph
* library using autoconf and its m4 macro AC_CHECK_LIB.
*
* Here is the code to add to your configure.in:
\verbatim
#
# Check for the OpenSceneGraph (OSG) Volume library
#
AC_CHECK_LIB(osg, osgVolumeGetVersion, ,
[AC_MSG_ERROR(OpenSceneGraph Volume library not found. See http://www.openscenegraph.org)],)
\endverbatim
*/
extern OSGVOLUME_EXPORT const char* osgVolumeGetVersion();
/**
* osgVolumeGetLibraryName() returns the library name in human friendly form.
*/
extern OSGVOLUME_EXPORT const char* osgVolumeGetLibraryName();
}
#endif

1
src/CMakeLists.txt
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@ -12,6 +12,7 @@ FOREACH( mylibfolder
osgParticle osgParticle
osgShadow osgShadow
osgTerrain osgTerrain
osgVolume
osgViewer osgViewer
) )

33
src/osgVolume/CMakeLists.txt Normal file
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@ -0,0 +1,33 @@
IF (DYNAMIC_OPENSCENEGRAPH)
ADD_DEFINITIONS(-DOSGVOLUME_LIBRARY)
ELSE (DYNAMIC_OPENSCENEGRAPH)
ADD_DEFINITIONS(-DOSG_LIBRARY_STATIC)
ENDIF(DYNAMIC_OPENSCENEGRAPH)
SET(LIB_NAME osgVolume)
SET(HEADER_PATH ${OpenSceneGraph_SOURCE_DIR}/include/${LIB_NAME})
SET(LIB_PUBLIC_HEADERS
${HEADER_PATH}/Export
${HEADER_PATH}/ImageUtils
${HEADER_PATH}/Version
)
# FIXME: For OS X, need flag for Framework or dylib
ADD_LIBRARY(${LIB_NAME}
${OPENSCENEGRAPH_USER_DEFINED_DYNAMIC_OR_STATIC}
${LIB_PUBLIC_HEADERS}
ImageUtils.cpp
Version.cpp
)
SET(TARGET_LIBRARIES_VARS FREETYPE_LIBRARY )
LINK_INTERNAL(${LIB_NAME}
osgDB
osg
OpenThreads
)
LINK_CORELIB_DEFAULT(${LIB_NAME})
INCLUDE(ModuleInstall OPTIONAL)

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <float.h>
#include <osg/Math>
#include <osg/Notify>
#include <osgVolume/ImageUtils>
using namespace osgVolume;
namespace osgVolume
{
struct FindRangeOperator
{
FindRangeOperator():
_rmin(FLT_MAX),
_rmax(-FLT_MAX),
_gmin(FLT_MAX),
_gmax(-FLT_MAX),
_bmin(FLT_MAX),
_bmax(-FLT_MAX),
_amin(FLT_MAX),
_amax(-FLT_MAX) {}
float _rmin, _rmax, _gmin, _gmax, _bmin, _bmax, _amin, _amax;
inline void luminance(float l) { rgba(l,l,l,l); }
inline void alpha(float a) { rgba(1.0f,1.0f,1.0f,a); }
inline void luminance_alpha(float l,float a) { rgba(l,l,l,a); }
inline void rgb(float r,float g,float b) { rgba(r,g,b,1.0f); }
inline void rgba(float r,float g,float b,float a)
{
_rmin = osg::minimum(r,_rmin);
_rmax = osg::maximum(r,_rmax);
_gmin = osg::minimum(g,_gmin);
_gmax = osg::maximum(g,_gmax);
_bmin = osg::minimum(b,_bmin);
_bmax = osg::maximum(b,_bmax);
_amin = osg::minimum(a,_amin);
_amax = osg::maximum(a,_amax);
}
};
struct OffsetAndScaleOperator
{
OffsetAndScaleOperator(const osg::Vec4& offset, const osg::Vec4& scale):
_offset(offset),
_scale(scale) {}
osg::Vec4 _offset;
osg::Vec4 _scale;
inline void luminance(float& l) const { l= _offset.r() + l*_scale.r(); }
inline void alpha(float& a) const { a = _offset.a() + a*_scale.a(); }
inline void luminance_alpha(float& l,float& a) const
{
l= _offset.r() + l*_scale.r();
a = _offset.a() + a*_scale.a();
}
inline void rgb(float& r,float& g,float& b) const
{
r = _offset.r() + r*_scale.r();
g = _offset.g() + g*_scale.g();
b = _offset.b() + b*_scale.b();
}
inline void rgba(float& r,float& g,float& b,float& a) const
{
r = _offset.r() + r*_scale.r();
g = _offset.g() + g*_scale.g();
b = _offset.b() + b*_scale.b();
a = _offset.a() + a*_scale.a();
}
};
}
bool osgVolume::computeMinMax(const osg::Image* image, osg::Vec4& minValue, osg::Vec4& maxValue)
{
if (!image) return false;
osgVolume::FindRangeOperator rangeOp;
readImage(image, rangeOp);
minValue.r() = rangeOp._rmin;
minValue.g() = rangeOp._gmin;
minValue.b() = rangeOp._bmin;
minValue.a() = rangeOp._amin;
maxValue.r() = rangeOp._rmax;
maxValue.g() = rangeOp._gmax;
maxValue.b() = rangeOp._bmax;
maxValue.a() = rangeOp._amax;
return minValue.r()<=maxValue.r() &&
minValue.g()<=maxValue.g() &&
minValue.b()<=maxValue.b() &&
minValue.a()<=maxValue.a();
}
bool osgVolume::offsetAndScaleImage(osg::Image* image, const osg::Vec4& offset, const osg::Vec4& scale)
{
if (!image) return false;
osgVolume::modifyImage(image,osgVolume::OffsetAndScaleOperator(offset, scale));
return true;
}

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <osgVolume/Version>
#include <osg/Version>
extern "C" {
const char* osgVolumeGetVersion()
{
return osgGetVersion();
}
const char* osgVolumeGetLibraryName()
{
return "OpenSceneGraph Volume Library";
}
}